In 2012, Knight Capital suffered a $440 million loss in just 45 minutes due to a combination of legacy code and a flawed deployment process. The incident stemmed from an unused feature, "Power Peg," which was inadvertently reactivated when a flag was reused for new code, leading to runaway order executions across seven servers after an initial misdiagnosis worsened the situation. This serves as a stark reminder for AI/ML/Data Science teams to prioritize code hygiene, rigorous deployment verification, and robust monitoring systems to prevent similar systemic failures.
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